{"nrhp_refnum":"83000332","name":"Commercial House","other_names":["Henderson House"],"category":"building","location":{"address":"4th and Main St.","address_restricted":false,"city":"Keithsburg","county":"Mercer County","state":"IL","lat":41.10558704700003,"lon":-90.94737446399995,"geom_source":"nps_gis"},"listed_date":"1983-05-09","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Commerce"],"significance_levels":["local"],"summary":{"what_it_is":"A two-story, L-shaped brick hotel with a stone foundation and Italianate details at Fourth and Main Streets in Keithsburg, Mercer County, Illinois. Built in 1849 as a private house and soon converted to a hotel, it is known as the Commercial House and later as the Henderson House or Henderson Hotel.","why_significant":"The nomination argues the building has integrity and is closely associated with the commercial development of Keithsburg (criterion B). It served travellers on commercial, political and legal business, first as the county seat's hotel and later during the river trade and sawmilling boom. Its prominence declined in the early twentieth century as the town lost its commercial role.","narrative":"Built in 1849 as the private house of William J. Patterson, this two-story brick building at Fourth and Main Streets in Keithsburg, Illinois, was sold within a year and converted into a hotel called the Commercial House. It has an L-shaped plan, a stone foundation, a low-pitched roof with small wooden brackets and other Italianate details. Interior walls, woodwork, flooring and many square-nailed trim pieces are original, and the hotel has eleven rooms on the first floor and thirteen on the second. Additions were made in 1890 and 1938. The hotel's location near the county courthouse, built across the street in 1851, made it a stopping place for people visiting on commercial, political or legal business. It kept serving travellers after the county seat moved to Aledo in 1857, supported by river trade and sawmilling. Renamed Henderson House in the 1930s, it is recognized for its link to the town's commercial growth.","period_of_significance":"1849-1938","architect_builder":null,"architectural_style":"Italianate","criteria":["B"],"status_note":"Listed as unoccupied with work in progress; wiring was being updated and a roof overhang had been removed after heavy damage and temporary repair.","vacant_flag":null,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:55:35.588609-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/opastorage/live/29/8937/28893729/content/electronic-records/rg-079/NPS_IL/83000332.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/83000332/e3ace4d8ea-800.webp","url_1600":"https://nationalhistoricalregister.com/media/83000332/e3ace4d8ea-1600.webp","licence":"Public domain","author":"Nyttend","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Commercial_House,_Keithsburg,_Illinois.jpg\" rel=\"noopener\">Nyttend</a>, Public domain, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Commercial_House,_Keithsburg,_Illinois.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/28893729","wikipedia":"https://en.wikipedia.org/wiki/Commercial_House_(Keithsburg,_Illinois)","wikidata":"https://www.wikidata.org/wiki/Q25205149"},"indexable":true,"url":"https://nationalhistoricalregister.com/illinois/mercer-county/commercial-house-83000332/"}